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        <canvas id="canvasban" width="1000" height="500"></canvas>
        <ul class="btn-list">
            <li><input type="color" id="colorBoard" value="colorBoard"></li>
            <li><input type="button" id="clearBoard" value="clearBoard"></li>
            <li><input type="button" id="xiangP" value="橡皮"></li>
            <li><input type="button" id="chexiao" value="撤销"></li>
            <li><input type="range" id="lineRu" value="lineWidth" min="1" max="30"></li>
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